Electrical junction box and connection therefor



Nov. 26, 1935. 2,021,912

ELECTRICAL JUNCTION BOX AND CONNECTION THEREFOR G. P. EDMOND$ 2 Sheets-Sheet -1 Original Filed April 25, 1930 I Gmryai idrzmal;

Nov. 26, 1935. s. P. EDMONDS ELECTRICAL JUNCTION BOX AND CONNECTION THEREFOR Original Filed A ruzs, 1930 2 Sheets-Sheet 2 (X67, 2/672 GeoryeP/E'Jmomi;

Patented Nov. 26, 193s UNITED STATES "PATENT OFFICE G a W Electric 8 .eorporationoflllinols 00., Chicago, Ill., 3,

Application April 25, 19.30, SerlalNo. 447,351

. Renewed May 10,1984

4 cum. (cl. s r-s)- This invention relates to electrical junction parts and connections therefor and is intended for use in high tension current installation, the -combination oiparts as here shown makingit' 5 possible to use a metal distributing cabinet instead of some sort of fragile material such as porcelain or the like which is commonly used in pot-heads and like devices, which this invention, in many instances, will supersede. l0 One of the objects of this invention is to provide means whereby a cabinet or Junction box may be made of substantial material, without regard to its insulating properties, but may be made of metal and the inleading cables so fitted that they may be attached to and supported by the cabinet without fear of short-circuitins the current. i 4

Another object of the invention is to provide a cable terminal that will have insulating prop-s 2) erties but will preferably be made of non-frangible material.

Another object of the invention is to pro de a cable terminal that will be easily and "safely handled while making connections. I

23 Another object of the invention is to provid 4 a structure whichwill aiford access to any indi vidual connection without disturbing the remainder. Y

In the drawingspot-head'sandthelihe.

'lheprobl'einindicatedthemistoavoidthe useofporcelainormaterialoflike-natureand a-distrihutingboxorcabinetpmferably Fig. l is avertical crosssection cabj ltwillbeseenbythismeansan protected and insulated from the 'minal fitting also will provide means for protecting the exposed'oiled end of the cable, at a point 'beyondthe usuallead sheath, atthe same time providing means for supporting the end of the cable; I

To this end is provided amain cabinet II which might be a transformer case, containing the wires .li-il for distributing the service. These wires are connected to insulated conduetors i2-'-I2 mounted in the wall ll of the cabinet .II. Secured'to the wall I! is'a chamber ll into which is introduced the terminals 1!. This chamber is provided with a removable cover It which is secured in position'as by the screws II-il. Screw threaded pipe plugs II and" ii are provided for. introducing and draining insulatin'g greaseor oil into and from the chamber A clamp-fitting 2| serves to connect conductors l2 tothe respective binding-posts ll of the terminals II. n v

The binding p'ost 2| rises from a capfl'which .is bored at ll to receive the exposed cable strands- 24 which are soldered in position'. The counterbore 2! facilitates the pouring. oftthe solder, thezil cap I! being inverted for this operation.

Anlnsulating sleeve It ls'provided, preferably made of 'such material as-will readily receive a substantial thread as at 21 to cooperate with corresponding threads of-the cap 22. cap-Ii so has a flange "between which and the upper end I of the sleeve 28 is a gasket 1!. Atthe lower end of the sleeve is another gasket-ll clamped in position between the lower edge of the sleeve and an'annular' fiangesli in a iitting 82. This fitting, which'ma'y be characterized as a-wiping sleeve, serves as'a means of supporting the member II as well as the cable "which is attached I to thelower reduced portion 34 of the fitting II as by a wiped lead joint indicated at 3'.

. 40 This wiping sleeve has a bolting flange II which.

provides means for bolting it to the bottom plate ll of the chamber ll by bolts "-48, whereby the gasket 80 may be clamped'be'tween the plate 81 and the II, The sleeve 20, surrounding the cable end, serves .to protect the oiled fabric wrapping. ll, which would otherwise be exposed where theleadsheath is terminated.

electrical distributing unit maybe made-of-no'n-insulatingu material andtheinieading' cable'terminusmaybe unit cabinet or boxfand assembledand that all 'Itistobeunderstood tchanlesandmodhll ilcations may be made without departing from the spirit of this invention.

I claim:

1. In combination, a metallic electric cable junction box, a binding post formed at the end of a cable extending therein, an electrically insulated'tubular housing supporting said binding post, a metal transformer case formed integral with said junction box, a conductor extending therein from said binding post and a tubular insulator surrounding said conductor and extending into both the transformer case and the Junction box.

2. In combination, a metallic electric cable junction box, a binding post formed at the end of a cable extending therein, a cylindrical fitting secured to said box, an electrically insulated tubuiar housing extending therefrom and supporting said binding post, a metal transformer case formed integral with said junction box, a wall thereoetween, a conductor extending through said wall from said binding post and a tubular insulator surrounding said conductor and extend construction of the type described comprising a metallic electric cable junction box, a cable extending through one of the walls thereof, a binding post stormed on the end of said cable, a oylin-' drical fitting for supporting said cable secured to said box, an electrically insulated tubular housing extending inwardly therefrom and supporting said binding post therein, a metal transformer case formed integral with said Junction box, a wall therebetween, a conductor extending through an opening in said walb from said binding post, a tubular insulator surrounding said conductor and extending through the same opening and lying in both the transformer case and the junction box, said insulator rigidly fastened to said wall to rigidly support said binding post.

4. The combination with a junction box of a tubular insulator passing through a wall thereof, a cable entering the outer end of the insulator and extending substantially to the inner end thereof, a terminal mounted upon and secured to the inner end of the insulator and having a tubular portion into which the end of the cable conductor enters, clamping means for clamping the tubular portion of said terminal where it surrounds the cable conductor end, said tubular insulator having a packing material joint connecting its outer portion with the wall through which it passes, and said tubular insulator having a projecting outer end which is screw-threaded and has a threaded connection with the exterior housing enclosing the portion of the cable about to enter the insulator.

GEORGE P. EDMONDS. 

